Use targed gml namespace if boundedBy/geometry is in gml namespace

[dstenger]

Fixes #1548
Please also see this issue for description of the bug.

The problem is that in Blob mode the namespace of the GML version of the original features is used (e.g. GML 3.2). This namespace is also used partly to write the response body although another GML version is expected (e.g. GML 3.1) leading to the documented exception.

This PR ensures that the targed GML namespace is used to write boundedBy and first geometry element if the geometry is in GML namespace preventing the mixing of GML versions.

[dstenger]

Another test should be done checking whether the generated GML 3.1 (from GML 3.2 Blob store) is schema valid.

[stephanr]

The fix seems to be reasonable to fix the output to be valid XML again.

Currently, I can not estimate what output will appear for GML3.2 blob data after the fix is applied.
Will the FeatureCollection contain a geometry in GML 3.2 or GML 3.1 ?
Another question would be if the Capabilities for this endpoint contains both GML versions or only 3.2.

If the endpoint only shows GML3.2, or can be changed to, as supported output format in the capabilities, another approach may be to force GML3.2 output in the case of BLOB storage.
This might be not compliant to OGC WFS 1.1.0 but at least consistent and an alternative to rewrite geometries of BLOB storage to different GML versions.

[tfr42]

The description of this PR shall be extended with the information how it behaves with the fix (paste the GML output here) for the different GML versions.

[tfr42]

The PR ensures that the namespace for GML that matches the WFS GetFeature request is set in the response.

Delimitation:

• The PR does not address the issue of the schemas generated for GML 3.1 being incorrect.
• The PR also does not fix the issue of a GML 3.1 geometry being output correctly in GML 3.2 when the type has changed from 3.1 to 3.2 (and vice versa).
• The PR does not ensure that GML 3.1.1 or 3.2.2 are fully supported.

[tfr42]

Open tasks:

• add hint to documentation about non transforming GML 3.1 to 3.2 and vice versa apply to blob store.